Periodic table
All 118 elements with trends, a comparison view and full property detail for each.
Chembook · iPhone
Chemistry in your hand. In three dimensions.
The reference you reach for mid-problem — all 118 elements, the NMR and IR tables, the constants and the glossary — next to things no book can do: ninety mechanisms you step through in 3D, computed orbitals you rotate, and a dynamics lab that integrates the equations of motion while you watch. Every byte of it on the device, with no account and no network.
What is inside
Five things it does that a textbook cannot.
Chembook is not a PDF with a search box. Each of these is interactive because the underlying data is real — precomputed quantum chemistry, shipped in the download and read from your device.
01 / REACTIONS
Step through the mechanism, not a diagram.
Ninety named organic mechanisms, frame by frame. Every structure is a real geometry — most of them quantum-optimized — with curved electron-pushing arrows drawn on the actual atoms rather than sketched over a picture. Toggle any reaction between the 3D model and a clean 2D skeletal depiction.
02 / ORBITALS
Orbitals you can turn in your hand.
Real computed isosurfaces rendered from volumetric data, not illustrations — s, p, d and f atomic orbitals through to molecular orbitals, with an energy ladder you tap to render each level and an isovalue control to thin or thicken the surface.
03 / VIBRATIONS
Watch the molecule move on each band.
Computed normal modes animated on the structure itself — pick a band and see exactly which stretch or bend it belongs to, with its symmetry label and whether it is IR or Raman active. The step between a spectrum and the motion behind it, which a printed table can only assert.
04 / DYNAMICS
A simulation, not an animation.
Argon condensing, water freezing into an ice lattice and melting again, salt dissolving in a polar solvent. Velocity Verlet with a Langevin thermostat, temperature and density under your control, and the radial distribution function redrawing as it runs.
05 / QUIZ
Recall practice that is actually chemistry.
Six modes: drag elements into the periodic table, draw compounds on a Lewis word-search grid against the clock, classify reaction mechanisms and predict the product, identify a group from its IR or NMR, name a vibration you are watching, and recall amino acids by structure and code. Scored, timed, and drawn from the same data as the reference side of the app.
And the rest of it
Everything else you look up.
Structures & conformers
Chair flips, anomers, amino acids, unit cells and framework solids, with a draggable Ramachandran plot.
Spectroscopy tables
¹H and ¹³C NMR shifts, IR and Raman bands, MS and UV-Vis — tap a row to plot its peak.
Encyclopedia
Constants, IUPAC nomenclature, significant figures, and a searchable glossary across ten topics.
Chemistry calculators
Stoichiometry, dilution, pH and gas laws, with significant figures handled properly.
Notes
Jot working alongside the reference. Saved on your device, never uploaded.
Offline by construction
Every mechanism, orbital cube, spectrum and reference table ships inside the download. The app makes no network requests at all — not for content, not for analytics, not for crash reports. It works the same on a plane, in a basement lab, or on a phone in airplane mode for a week.
That is also why there is nothing to collect. Chembook has no account, no sign-in, and no server. Your progress, bookmarks and quiz results are files in the app's own storage on your device, and Settings → Reset all data erases them.
We have declared Data Not Collected on the App Store, and the privacy manifest inside the app says the same. Read the Chembook privacy policy.
Pricing
Most of it is free. One purchase unlocks the rest.
No subscription, no consumables, no ads. A single non-consumable purchase, tied to your App Store account and restorable on any device you own.
Free
$0 no account
- 20 core reaction mechanisms in 3D, with electron-pushing arrows
- The full periodic table, all 118 elements with trends and comparison
- Every spectroscopy tab, all orbitals and structures, the molecular dynamics lab, the encyclopedia and the calculators
- A set of free rounds in each of the six quiz modes
The free tier is a working reference on its own, not a trial that expires.
Premium
Paid once, forever
- Everything in Free
- All 90 reaction mechanisms, including the named and organometallic ones
- Unlimited play in every quiz mode
- Every premium feature added later, at no extra cost
Purchases are handled entirely by the App Store — we never see your payment details. Use Restore Purchases on a new device.
Coming to the App Store
Chembook is on its way to iPhone.
Submitted for review. Chembook is a Qemica Lab app — the same people who build the desktop workbench.